WIN-911 utilizes Wibu's licensing management software, CodeMeter, for license activation and protection. When a license is activated using Codemeter, it locks to the hardware profile of the PC it is running on. In order for Codemeter to lock a license to a hardware profile, it must read hardware level details. E.g. CPU serial number or MAC addresses of network cards. When you install CodeMeter on a ftServer, the redundant hardware does not have identical hardware details which will causes the server to lose lockstep which results in a fail over.
Wibu has released a new version of the CodeMeter runtime which resolves this issue. You will need to download the new runtime and install over their existing version of CodeMeter. License information will remain in place after the update. Wibu recommends running their installer by right-clicking the EXE and selecting "Run as administrator".
If you experience any issues with the download link, please try: https://www.wibu.com/support/user/downloads-user-software.html